Building corner assembly

ABSTRACT

A building corner assembly is provided for joining a pair of walls which lie in intersecting planes. Both walls terminate in arms which also lie in intersecting planes. The assembly also includes a post which has a pair of channels running along its length. The assembly further includes a corner lock which also has a pair of arms. One arm of the corner lock and the arm of one wall fit into one channel of the corner post, and the other arm of the corner lock and the arm of the other wall fit into the other channel of the corner post. The arms of the walls protrude toward the arms of the corner lock within their respective channels of the corner post and thereby enter into an interlocking relationship.

States atent 1 ail.

Apr. 24,1973

I BUILDING CORNER ASSEMBLY Inventor: Abner Dean, 166 E. 61st St., New Primary EXami' 'er Hemy Su the rland York, 10021 Asszstanl ExammerJames L. Rldgill, Jr.

Att0rney'Gottlieb, Rackman, Reisman July 16, 1971 [22 Filed:

App]. No.1 163,281

A building corner assembly is provided for joining a [52] U.S.Cl. ........................52/282, 52/568, 52/586, pair of walls which lie in intersecting planes. Both walls terminate in arms which also lie in intersecting planes. The assembly also includes a post which has a [51] Int. 1/54, E04b 5/00 Field of Search......................

287, pair of channels running along its length. The as-- sembly further includes a corner lock which also has a 20-92 20-92 D pair of arms. One arm of the corner lock and the arm,-

of one wall fit into one channel of the corner post, and [56] References C'ted the other arm of the corner lock and the arm of the other wall fit into the other channel of the corner post.

UNITED STATES PATENTS The arms of the walls protrude toward the arms of the 2,364,083 12/1944 Lindsay.......................287/I89.36D Corner lock Within their respective channels of the corner post and thereby enter into an interlocking relationship.

FOREIGN PATENTS OR APPLICATIONS 12 Claims, 11 Drawing Figures 005 600 52 22 55 53 CC HP 38 ff FF 2 22 99 Q04 22 22 39 23 55 Patented A ril 24, 1973 7 Sheef-Shejl INV STOR. ABNER DEAN FIG. 9'

7 Sheets-Sheet* FIG. 8

lxvmmiz. AHEEQ D EL.

- Patented A ril 24,1973 3w 533 511354145 3,728,834

7 4 0 4 2 6. 2 & MM 2 6 O 5 4 4 M w No 2 \v \P 4. u w m Patented April 24, 197 3 7 Sheets-Sheet a Patented April 24, 1973 7 Sheets-Sheet 4.

Patented April 24, 1973 7 Sheets-Sheet 5 LEV/1177M." ABNER DEAN FIG. 5

BUILDING CORNER ASSEMBLY The present invention relates generally to a building corner assembly, and more specifically to a building construction for joining the walls of any structure in an interlocked relationship. The walls are permanently interlocked to a corner post without the use of nails or other conventional fastening means.

In the conventional construction of buildings and other walled structures, components are joined by use of varying fastening means, such as nails, rivets, screws, adhesives and other fasteners which are well-known. Of late, there have been significant developments in the construction of building structures through the use of pre-formed components. However, such pre-formed components are still held to one another by conventional fasteners.

It is the object of the present invention to provide a corner assembly for a building structure which utilizes pre-formed components, and which would join such pre-formed components at the corners of the structure without the necessity of using nails, rivets or other similar fasteners.

It is still a further object of the present invention to provide a building corner assembly of the character described in which the components at this location are few in number and simple to construct by known massproduction methods.

It is still a further object of the present invention to provide a building corner assembly of the character described which can be assembled by workmen easily and quickly, and which requires such workmen to possess only a relatively low level of skill.

In general, the building corner assembly of the present invention comprises a pair of walls which are to be fixed in intersecting planes and which are joined at a corner of the structure. The walls intermediate in arms of L-shaped" configuration at the structure corner, and these arms protrude perpendicularly from their respective walls. A post forms another component of the assembly and has a pair of elongated channels which run substantially the length of the post. The assembly further includes a corner lock which also has a pair of arms, with one arm of the lock and the arm of one wall being received in one channel of the corner post, and the other arm of the corner lock and the arm of the other wall being received in the other channel of the corner post. A portion of the arm of a wall in each channel extends across a portion of the arm of the corner lock in the same channel, thereby preventing disengagement of the walls and thereby also locking the entire assembly into interlocked relation.

Other objects, features and embodiments of the invention are contemplated and will be apparent from the following more detailed description with reference to the accompanying drawings, in which:

FIG. 1 is a cutaway perspective view of the building corner assembly, with the various components thereof cut at different levels for the purpose of clarity;

FIG. 2 is a cross-sectional view of the building corner assembly, taken substantially along the line 2-2 of FIG. 1;

FIG. 3 is a perspective view showing the first step in the assembly of the building corner;

FIGS. 4, 5 and 6 show additional and successive steps in the assembly of the building corner;

FIGS. 7, 8 and 9 are cross-sectional views of other embodiments of the corner assembly;

FIG. 10 is a cutaway perspective view of a doublewalled embodiment of the building corner, with the various components thereof cut at different levels for the purpose of clarity, and in a form having both outside and inside corners; and

FIG. 11 is a cross-sectional view of the embodiment shown in FIG. 10, taken substantially along the lines 11-11 ofFIG. 10.

Referring initially to FIGS. 1 and 2, there is shown a building corner assembly 10 of the type intended to be formed of pre-made building structural components. More specifically, the various components thereof are intended to be made at a factory site and transported to the building site. The factory site may be close to or distant from the building site. In any case, these components are pre-formed and are joined together to make a building corner assembly at the building site. The assembly includes a pair of walls 12, 14, which in the embodiment shown, are outer walls of the building structure. The walls, as well as the other components of the corner assembly, may be formed of wood, concrete, metal or plastic, or composite materials as is best suited for the building structure, its intended use and its climate. The walls 12, 14 lie in intersecting planes which meet at corner intersection line L, and the walls will hereinafter be referred to for convenience as the first wall and the second wall respectively.

Each wall terminates, where one wall is adjacent the other, in an arm of L-shaped configuration, the wall 12 having an L-shaped arm 16 and the wall 14 having an L-shaped arm 18. The arms l6, 18 are of identical configuration, but are mirror images of one another when the walls 12, 14 are in place in the corner assembly. Each wall arm comprises two branches, with the arm 18 having a branch 20 extending inwardly with respect to the corner and at a right angle to its wall 14, and having a second branch 22 extending toward the corner intersection line L, and the branch 22 lying in a plane generally parallel to the plane of the second wall 14. The branches 20, 22 combine to form the L" of the arm 18. In a similar manner, the arm 16 of the first be understood that the walls can extend to any extent desired and are otherwise conventional in nature. They may, for example, include both door and window passageways.

The assembly 10 includes as another component, a corner post 28. The corner post includes two sets of wall segments, one set comprising three wall segments 30, 32 and 34 which, taken by themselves are of U- shaped" configuration and define between them an elongated channel 36, the channel running substantially the entire length of the corner post 28. The other set of three wall segments, namely wall segments 38, 40 and 42 also forms a U-shaped configuration. These segments create another channel 44 which runs substantially the entire length of the corner post 28 and which has dimensions generally identical to the dimensions of the channel 36. The channel 36 opens towards the second wall 14, while the channel 44 opens towards the first wall 12. Hence these channels open towards intersecting planes. The channels 36, 44 have widths which are approximately the same as the length of the branches 22, 26 of the arms 18, 16 respectively. 7

The building corner assembly 10 further includes as an additional component, a corner lock 46, and specifically an outer corner lock. The corner lock runs generally parallel to the length of the corner post 28 and is generally of C-shaped configuration, having a pair of opposed mirror-image arms 48, 50. Each arm includes a pair of branches, the arm 48 including branches 52, 54 and the arm 50 including branches 56, and 58. The branches 48, 50 are parallel to and colinear with the walls 14, 12 respectively, while the branches 54, 58 are in planes parallel to the planes of the branches 20, 24 of arms l8, 16 respectively.

In the interlocked form of the components mentioned, it will be seen that the branch 54 of arm 48 of the corner lock 46 protrudes into the channel 36 of the corner post 28. Branch 20 of arm 18 of the second wall 14 is also received in the same channel. In a similar manner, branch 58 of arm 50 of the corner lock 46 is received in the channel 44 of corner post 28, along with branch 24 of arm 16 of the first wall 12. Moreover, the branches 22, 26 of the arms 18, 16 respectively extend towards the branches 54, 58 transversely of the channels 36, 44 respectively. The branches 22, 26 are situated within the channels 36, 44, respectively, at locations interiorally of the branches 54, 58, at the innermost ends of said channels.

The walls 12, 14 and the corner lock 46, may be termed an outer corner lock assembly, since they are located on the exposed face of the building structure. It may be desired in connection with some building structures to provide an inner corner lock assembly, which interlocks with the components previously mentioned, thereby to provide a double" wall structure. For this purpose, the corner assembly further includes a first inner wall 100 and a second inner wall 102, these walls lying in intersecting planes which intersect at an inner corner line I, the first inner wall 100 being in a plane parallel to the plane of the first outer wall 12, and the second inner wall 102 lying in a plane parallel to the plane of the second outer wall 14. The first inner wall includes an arm 104 of L-shaped configuration, having a branch 106 extending perpendicularly to the wall 100 and towards the exterior of the corner, and a branch 108 extending generally parallel to the wall 100 also towards the exterior of the corner. In a similar manner, the second inner wall 102 includes an arm 110 of L-shaped configuration, including a branch 112 which extends perpendicularly to the wall 102 and a branch 114 which extends parallel to the wall 102. The arm 104 is a mirror image of the arm 110, when the corner is assembled.

The corner post 28 also includes another pair of channels to receive and lock with the inner walls. To this end, the post 28 includes wall segments 116, 118 on one side thereof and segments 120, 122 on the other side thereof, the segments 38, 116, and 118 being of C-shaped" configuration to thereby form an elongated channel 124 which runs substantially the entire length of the post and which opens towards the first inner wall 100. The segments 34, 120 and 122 are also of C-shaped" configuration, defining a channel 126 which runs substantially the entire length of the post and opens towards the plane of the second inner wall 102.

The inner wall assembly further includes an inner corner lock 128 which includes a pair of L-shaped arms, namely arms 130, 132. The arm 130 has branches 134, 136 which combine to form the mentioned L-shaped configuration, while the arm 132 has branches 138, which combine to form the other L-shaped" configuration. I

The branch 134 of the arm 130 of the inner corner lock 128 is received within the channel 124 along with the branch 108 and a major portion of the branch 106 of the arm 104 of the first inner wall 100, and similarly, the branch 140 of the leg 132 of the inner corner lock 128 is received along with the branch 114 and a major portion of the branch 112 of the arm 110 of the second inner wall 102 in the channel 126.

It should be noted, as was characteristic of the outer corner lock assembly, that the branch 108 of the arm 104 protrudes transversely of the channel 124. The arm 108 is situated interiorly of the channel with respect to branch 134 of the arm 130. In a similar manner, the branch 1 14 of the arm 1 10 of the second inner wall 102 protrudes transversely across the channel 126 at a location interiorly of the channel with respect to the branch 140 of the arm 132 of the inner corner lock 128.

FIGS. 3, 4, 5 and 6 show the steps in the interlocking of the foregoing components to form the building corner assembly 10. Referring first to FIG. 3, and starting for the sake of convenience with the assembly of the outer walls (though the inner walls are desirably placed in an interior position to be assembled or are even assembled first), the second outer wall 14 is moved in the direction indicated by the arrow A towards the corner post 28. It is moved from the position shown in full lines to the position shown in dash lines. In so doing, the wall 14 is mated with the corner post 28 so that the arm 18 of the wall 14 is inserted into and received within the corresponding channel 36 of the corner post 28. The first outer wall 12 is also moved in the same manner so that the arm l6 of said wall is inserted into and received in the corresponding channel 44 of the corner post 28. The final position of the first outer wall 12 is shown in FIG. 4. Further, either of the walls 12 or 14 may be moved towards the corner post for engagement purposes before the other, or such movement may be done simultaneously.

The corner post 28 may, if so desired have its lowermost portion driven directly into the ground or may be fixed to the foundation of a building structure. The manner of such fixation may be conventional and is not significant for the purpose of the present disclosure. However, usually the corner post 28 will be vertically oriented, and the walls 12, 14 will be moved towards it in a horizontal direction. This is advantageous, since the walls 12, 14 may be quite large and heavy, and the ability to mate these walls with the corner post 28 by horizontal movement would eliminate any necessity for lifting these walls by a crane and then dropping them vertically. The walls 12, 14 are now temporarily secured in place by conventional retaining means, as by a crane. Y

Referring next to FIG. 4, the corner post 28 is shown having already been mated with the second outer wall 14 and the first outer wall 12. Next, the outer corner lock 46 is slipped vertically downwardly so that the lock moves from the position shown in solid lines to the position shown in dash lines. In so doing, the branch 54 of the arm 48 slides into the corresponding channel 36 of the corner post while the branch 58 of the arm 50 slides into the corresponding channel 44 of the corner post. In this movement, the branches 54, 58 fill the space remaining in the channels 36, 44, after the arms 16, 18 are placed therein.

While the outer corner lock 46 is inserted by vertical movement as indicated by the arrow B into the partially completed assembly, this component is relatively small in structure and light in weight and can be readily maneuvered for this purpose. After the outer corner lock 46 has been inserted in the manner described, neither the outer corner lock 46 nor the walls 12, 14 can be removed in a horizontal direction from the corner post 28 so that an interlocked assembly has been created.

FIG. 5 shows the next step in the assembly of the inner wall construction, with the second inner wall 102 being moved in the direction indicated by the arrow C from the position shown in solid lines to the position shown in dash lines. In such movement, the arm 110 of the wall 102 is received in the channel 126 of the corner post 28. The first inner wall 100 will also be moved so that its arm 104 is received in the channel 124 of the post 48, as seen in FIG. 6.

FIG. 6 shows the final step in the construction of the building corner assembly. The first inner wall 100 and the second inner wall 102 are in place with respect to the corner post 28. Next, the inner corner lock 128 is moved in the direction indicated by the arrow D from the position shown in full lines to the position shown in dash lines. In this movement, the arm 132 of the inner corner lock 128 has its branch 140 received in the channel 126 and the other arm 130 of the inner corner lock has its branch 134 received in the channel 124 in the corner post 28. In moving the inner corner lock 128 in this manner, a crane is utilized. but this again is a relatively small effort as required to the movement of the first and second inner walls 100, 102, respectively, which have been moved in a horizontal direction.

After the inner corner lock 128 is in place, both inner walls, 100, 102, and both outer walls 12, l4'are permanently locked in place against horizontal movement.

It is not necessary, within the scope of the present invention, that the outer walls of the assembly form right angles with respect to one another. Rather, obtuse angles may be formed with the same result. This ability of the present invention gives greater flexibility and design possibilities to the structure. As an example of the foregoing, FIG. 7 is a cross-section of another embodiment 200 of the assembly showing that in crosssection, the first outer wall 12' and second outer wall 14 meet at an interior angle which is greater than 90 but less than 180, and the first inner wall 100 and the second inner wall 102 will meet at an identical exterior angle. The construction of the various components of the embodiment 200 are essentially identical with the first embodiment 10, except for the following relatively minor differences. First, the angle between branches 52', 56 of corner block 46, is 0. Further, the angle between wall segments 42', 30' of corner post 28' has decreased from to the same extent that 0 is greater than 90 and the angle between segments 32', 40 has similarly increased. In all other respects, the construction of FIG. 7 is identical to the construction of FIGS. 1 and 2.

It has been mentioned in connection with the description of the embodiment of FIGS. 1 and 2, that each of the walls, for example, the second outer wall 14, has as a portion of its arm 18, i.e., the branch 22, which protrudes transverselyof the channel in which it is located at a location interiorly of the branch 54 of the leg 48 situated in the same channel 36. In the embodiment as shown in FIGS. 1 and 2, the branch 22 is situated at the interior end of the channel 36, beyond the end of the branch 54.

However, as set forth in the embodiments shown in FIGS. 8 and 9, the assembly is operable, that is, interlocks, as long as any portion of the arm of a wall in a channel protrudes towards and at least in part beyond the arm of the corner lock in the same channel. Turning first to FIG. 8, an embodiment 300 is shown therein which differs from the embodiment shown in FIGS. 1 and 2 only in the construction of the branches S4", 58" of the corner lock 46", and in the construction of the branch 20 of the arm 18" and the branch 24" of the arm 16" of the outer walls 14'', 12", respectively. The branch 24 has its branch 26" near the mid-portion thereof (rather than at the end thereof as seen in FIGS. 1 and 2) and said branch 26" protrudes into a notch 302 in the branch 58". Similarly, the branch 20" has its branch 22" midway of its length. The branch 22" protrudes into a notch 304 in the branch 54".

The same principle is demonstrated in the embodiment 400 of FIG. 9. In this embodiment, only the construction of the branch 58" and the branch 24" on one side of the outer corner lock 46" and the branch 54" and the branch 20" are changed, as compared to the embodiment 10 of FIGS. 1 and 2. In this instance, the branch 58" carries a small protrusion 402 and the branch 24" carries its branch 26" so that said branch protrudes behind the protrusion 402 transversely of the channel in which these components are located. Similarly, the branch 54" carries a small protrusion 404 and the branch 20" carries its branch 22" in a manner such that the branch 22' protrudes behind protrusion 404 transversely of the channel in which these components are located. The arms of the interior walls and the arms of the inner corner lock may be similarly modified, if so desired.

FIGS. 10 and 11 show yet another embodiment 500 of the building corner assembly, differing from the prior constructions primarily in that the inner and outer walls are. integral with one another thereby eliminating completely any inner corner lock. This construction is advantageous in that there are fewer numbers of parts and the entire assembly can be constructed more readily. In addition, the embodiment 500 shows the manner in which both inside" and outside" corners or L" configurations would be constructed, permitting design flexibility.

Referring first to the corner assembly 502, which is an outside corner, this assembly includes a first wall 504 which includes an inner partition 506 and an outer partition 508. The partitions 506, 508 are joined by spacers 510. Similarly, the corner assembly 502 includes a second wall 512 which includes an inner partition 514 and an outer partition 516.

The corner assembly 502 includes a corner lock 518 which is substantially identical to the corner lock 46 of the first embodiment. Further, the corner assembly 502 has a corner post 520 which is substantially similar to the corner post 28 of the first embodiment, except that the segments 116, 118 are eliminated from one side of the corner post, and the segments 120, 122 are eliminated from the other side of the corner post, this being due to the fact that no separate interlocking is required with an inner corner lock or inner walls. The first wall 504 has an arm 522 of L-shaped configuration which mates with the arm 524 of the corner block 518 in one channel 526 of the corner post 520, and the corresponding components of the corner lock 518 nd the second wall 512 mate within the other channel 528 of the corner post 520.

The inside corner assembly 600 joins the wall 512 with another wall 602, comprising partitions 604 and 606. The assembly includes a corner lock 608 and a corner post 610. The post 610 has a pair of channels 612, 614 formed therein to receive the mating arms of the lock 608 and walls 512, 602 in the manner previously described.

lt will be apparent that there has been disclosed a corner assembly in several embodiments which enables pre-formed building walls to be joined without fasteners in a manner which is quick and simple and which can be performed by workers ofa low skill level, and even by home craftsmen.

It should be appreciated that the corner assembly disclosed in the present application may also be used in structures other than buildings, and such use is within the scope of the present invention. By way of example, the corner assembly may be utilized to form crates, the type used to ship and store merchandise, may be used in the making of furniture, including for example, desks, bureaus and storage units as well as to form shelving. In other words, the present invention may be advantageously utilized wherever it is desired to form two wall components into a fixed relationship without the use of conventional fasteners.

A latitude of modification, change and substitution is intended in the foregoing disclosure and in some instances some features of the invention will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.

What is claimed is:

1. A double-walled structural corner assembly comprising a. first and second outer walls each including an arm,

said walls being in intersecting planes,

b. first and second inner walls each including an arm,

said walls being in intersecting planes,

c. a structurally-rigid post for interlocking the walls and including channels running along a portion of the length of the post,

d. outer and inner corner locks each including a pair of arms, the locks being matable with the ost only by movement in a direction parallel to an m alignment with the channels, and

e. the arm of the first outer wall and one arm of the outer corner lock being received in one channel and the arm of the second outer wall and the other arm of the outer corner lock being received in another channel, the arm of the first inner wall and one arm of the inner corner lock being received in another channel, and the arm of the second inner wall and the other arm of the inner corner lock being received in another channel, a portion of the arm of a wall in each channel extending transversely of and inwardly of a portion of the arm of the corner lock in the same channel.

2. A structural corner assembly comprising a. a first wall including an arm,

b. a second wall including an arm, the first and second walls being in intersecting planes,

0. a post for interlocking the walls and including a pair of channels running along a portion of the length of the post,

d. a structurally-rigid corner lock including a pair of arms, the lock being matable with the post only by movement in a direction parallel to and in alignment with the channels,

e. the arm of the first wall and one arm of the corner lock being received in one channel and the arm of the second wall and the other arm of the corner lock being received in the other channel, a portion of the arm of a wall in each channel extending transversely of and inwardly of a portion of the arm of the corner lock in the same channel.

3. A structural corner assembly as set forth in claim 1 wherein the corner lock is of C-shaped" configuration.

4. A structural corner assembly as set forth in claim 1 wherein the walls meet at an approximately angle.

5. A structural corner assembly as set forth in claim 1 wherein the walls meet at an interior angle of greater than 90 but less than 6. A structural corner assembly as set forth in claim 1 wherein each wall includes an inner partition, an outer partition, and members joining the partitions.

7. A structural corner assembly as set forth in claim 1 wherein the arm of each wall is of L-shaped configuration. 1

8. A structural corner assembly as set forth in claim 2 wherein the said portions of the arms extend across the entire width of their respective channels.

9. A structural, corner assembly as set forth in claim 8 wherein portions of the arms of the corner lock in each channel protrude toward the portions of the arms of the walls in the same channel.

10. A structural corner assembly as set forth in claim 8 wherein the said portions of the arms are situated at the interior ends of their respective channels.

1 1. A structural corner assembly as set forth in claim 8 wherein the said portions of the arms are situated at locations other than at the interior ends of their respective channels.

12. A structural corner assembly as set forth in claim 11 wherein the arms of the corner locks include notches to receive the said portions. 

1. A double-walled structural corner assembly comprising a. first and second outer walls each including an arm, said walls being in intersecting planes, b. first and second inner walls each including an arm, said walls being in intersecting planes, c. a structurally-rigid post for interlocking the walls and including channels running along a portion of the length of the post, d. outer and inner corner locks each including a pair of arms, the locks being matable with the post only by movement in a direction parallel to and in alignment with the channels, and e. the arm of the first outer wall and one arm of the outer corner lock being received in one channel and the arm of the second outer wall and the other arm of the outer corner lock being received in another channel, the arm of the first inner wall and one arm of the inner corner lock being received in another channel, and the arm of the second inner wall and the other arm of the inner corner lock being received in another channel, a portion of the arm of a wall in each channel extending transversely of and inwardly of a portion of the arm of the corner lock in the same channel.
 2. A structural corner assembly comprising a. a first wall including an arm, b. a second wall including an arm, the first and second walls being in intersecting planes, c. a post for interlocking the walls and including a pair of channels running along a portion of the length of the post, d. a structurally-rigid corner lock including a pair of arms, the lock being matable with the post only by movement in a direction parallel to and in alignment with the channels, e. the arm of the first wall and one arm of the corner lock being received in one channel and the arm of the second wall and the other arm of the corner lock being received in the other channel, a portion of the arm of a wall in each channel extending transversely of and inwardly of a portion of the arm of the corner lock in the same channel.
 3. A structural corner assembly as set forth in claim 1 wherein the corner lock is of ''''C-shaped'''' configuration.
 4. A structural corner assembly as set forth in claim 1 wherein the walls meet at an approximately 90* angle.
 5. A structural corner assembly as set forth in claim 1 wherein the walls meet at an interior angle of greater than 90* but less than 180* .
 6. A structural corner assembly as set forth in claim 1 wherein each wall includes an inner partition, an outer partition, and members joining the partitions.
 7. A structural corner assembly as set forth in claim 1 wherein the arm of each wall is of ''''L-shaped'''' configuration.
 8. A structural corner assembly as set forth in claim 2 wherein the said portions of the arms extend across the entire width of their respective channels.
 9. A structural corner assembly as set forth in claim 8 wherein portions of the arms of the corner lock in each channel protrude toward the portions of the arms of the walls in the same channel.
 10. A structural corner assembly as set forth in claim 8 wherein the said portions of the arms are sitUated at the interior ends of their respective channels.
 11. A structural corner assembly as set forth in claim 8 wherein the said portions of the arms are situated at locations other than at the interior ends of their respective channels.
 12. A structural corner assembly as set forth in claim 11 wherein the arms of the corner locks include notches to receive the said portions. 